Anilazine ‐ formation of bound residues in a degraded loess soil

Abstract

The incorporation and extractability of benzene [ring‐U‐¹⁴C] and [triazine‐U‐¹⁴C] anilazine in a degraded loess soil were studied over a period of 100 days. The soil was extracted with a simulated soil solution (0.01 M CaCl₂), as well as with two different organic solvent mixtures, on day 0, 6, 28 and 100 after applying the active substance. Immediately after the application of anilazine to the soil, only 31% of the ¹⁴C activity applied could still be rendered soluble by 0.01 M CaCl₂. This fraction dropped to 16% after 6 days and at the conclusion of the experiment after 100 days amounted to approximately 10% of the radioactivity applied. The two solvent mixtures dissolved 54 and 57% of the applied radioactivity respectively on day 0. From day 6 to day 100 the extractable portions were with 26 and 14% almost constant. It was determined by means of thin‐layer chro‐matography that with increasing experimental duration dihydroxy‐anilazine represented the major fraction of radioactivity in the organic phase, whereas anilazine was reduced from 39% immediately after application to approximately 1% after 100 days. No significant difference was established in the behaviour of [benzene ring‐U‐¹⁴C] and [triazine‐U‐¹⁴C] anilazine in the soil.

Key words:

• fungicides
• anilazine
• bound residues